Built-in durability: Introducing Workflow Development Kit

Vercel has released the Workflow Development Kit (WDK), an open source TypeScript framework that adds durability to async functions without requiring message queues, retry logic, or a persistence layer to be built by hand.

• Two directives, "use workflow" and "use step", turn an ordinary async function into a durable workflow made up of steps that persist progress and retry automatically on failure.
• Workflows can pause with a sleep call for minutes or months, or pause on a webhook until an external event (like a payment confirmation) arrives, all without consuming resources while waiting.
• Every step, input, output, pause, and error is recorded in an event log, viewable through an included CLI and web UI for tracing runs and failures.
• Execution environments are called Worlds: a Local World runs workflows without provisioning infrastructure during development, a Vercel World handles persistence and routing automatically in production, and the framework is portable to other runtimes via custom Worlds, including a published reference Postgres World.

Vercel positions WDK for AI agents that need to pause between API calls, RAG pipelines that must survive crashes during long-running processing, and commerce systems waiting on user confirmation over days. Read the full announcement on Vercel's blog.

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